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Segment Information - Long-Lived Assets by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets $ 3,050,165 $ 3,045,368 $ 3,023,156
North American Region      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 1,543,662 1,566,621 1,557,153
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 1,490,000 1,570,000 1,570,000
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets $ 1,506,503 $ 1,478,747 $ 1,466,003